Intermodal group delay in multimode waveguides on LNOI and SOI for Optical Interconnects

Kaushalram, A and Talabattula, S (2019) Intermodal group delay in multimode waveguides on LNOI and SOI for Optical Interconnects. In: 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 23-27 June 2019, Munich, Germany, Germany.

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Abstract

Mode division multiplexing (MDM) is one of the recent technologies to circumvent the capacity-crunch in single-mode waveguides for on-chip communication 1. MDM uses orthogonal modes of multimode waveguides as independent carriers, that can be employed in optical interconnects for on-chip communication between multiple cores. Intermodal group delay (��g) that causes pulse broadening, limits the data rate in such digital communication systems. ��g arises because of differences in the group velocities of various modes propagating in multimode waveguides. This paper numerically evaluates group delay (�g) for four-mode wide waveguides supporting four quasi transverse electric (qTE) modes on buried, strip and rib configurations as well as tall waveguides supporting four quasi transverse magnetic (qTM) modes. Waveguides are designed on lithium niobate on insulator (LNOI) with X-cut, Z-cut orientation and silicon on insulator (SOI) high-contrast integrated photonic platforms at a wavelength (λ) of 1550 nm. The dimensions are tailored to have good power confinement in the core (> 75%) along with a TE polarization fraction > 92% for qTE and < 5% for qTM modes. A full-vectorial numerical mode solver is used to find group index for all modes, which varies as a function of wavelength. �g per unit length of the waveguide is evaluated from equation (1). The group delay difference between the fastest and the slowest mode is considered as the overall intermodal group delay of the waveguide (10 mm long). © 2019 IEEE

Item Type:	Conference Paper
Publication:	Optics InfoBase Conference Papers
Publisher:	OSA - The Optical Society
Additional Information:	cited By 0; Conference of The European Conference on Lasers and Electro-Optics, CLEOEurope₂₀₁₉ ; Conference Date: 23 June 2019 Through 27 June 2019; Conference Code:142098
Keywords:	Digital communication systems; Group delay; Integrated circuit interconnects; Niobium compounds; Optical communication; Optical interconnects; Silicon on insulator technology; Silicon photonics; Waveguide couplers, Group delay difference; Integrated photonics; Mode-division multiplexing; Multi-mode waveguides; On chip communication; Silicon-on- insulators (SOI); Single mode waveguides; Transverse electrics, Optical waveguides
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	13 Nov 2020 11:37
Last Modified:	13 Nov 2020 11:37
URI:	http://eprints.iisc.ac.in/id/eprint/65546

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